Physics 202 Homework, Day 08: Chapter 15: #18,21,27, 39
ü 18. (a) Determine the electric field strength at a point 1.00 cm to the left of the middle charge in the figure
below.
(b) If a -2.00 µC charge is placed at this point, what are the magnitude and direction of the force on it?
ü 21. A charge of -5.0 nC is at the origin, and a second charge of 7.0 nC is at x = 4.00 m. Find the magnitude
and direction of the electric field halfway between the two
charges.
ü 27. In the figrure below, determine the point (other than infinity) at which the total electric field is
zero.
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Day_08_sol.nb
27. In the figrure below, determine the point (other than infinity) at which the total electric field is
zero.
ü 39. A Van de Graaf generator is charged so that a proton at its surface accelerates radially outward at 1.52
x 1012 m/s 2 . Find (a) the magnitude of the electrid force on the proton at that instant. [You will need to look
up the charge and mass of a proton for this part.]
(b) the magnitude and direction of the electric field at the surface of the generator.
ü